JPS6469880A - Failure detecting valve - Google Patents

Failure detecting valve

Info

Publication number
JPS6469880A
JPS6469880A JP22679787A JP22679787A JPS6469880A JP S6469880 A JPS6469880 A JP S6469880A JP 22679787 A JP22679787 A JP 22679787A JP 22679787 A JP22679787 A JP 22679787A JP S6469880 A JPS6469880 A JP S6469880A
Authority
JP
Japan
Prior art keywords
pressure chamber
failure
piston
pressure
main piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22679787A
Other languages
Japanese (ja)
Inventor
Koichi Hara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP22679787A priority Critical patent/JPS6469880A/en
Publication of JPS6469880A publication Critical patent/JPS6469880A/en
Pending legal-status Critical Current

Links

Landscapes

  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

PURPOSE:To change over the valve in the caption automatically to a normal position in case of failure by transmitting the pressing force of a push rod to a valve member via pressure in a pressure chamber being formed of a main piston and an auxiliary piston. CONSTITUTION:A main piston 5 is hollowed and an auxiliary piston 9 is fitted into the hollow part thereof, the both pistons forming a pressure chamber 11. The pressure chamber 11 is connected to a pilot port 13 formed in a valve body 1 via a small hole 12 formed in the main piston 5. A push rod 15 which exerts a pressing force in accordance with the exciting current of an electromagnetic drive part 14 is allowed to contact with the auxiliary piston 9. In the case of an electric system failure, the electromagnetic drive part 14 is not excited and a spool 4 therefore is not changed over. Also the failure of a hydraulic system will not allow the spool 4 to move, since pressure is not produced in the pressure chamber 11.
JP22679787A 1987-09-10 1987-09-10 Failure detecting valve Pending JPS6469880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22679787A JPS6469880A (en) 1987-09-10 1987-09-10 Failure detecting valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22679787A JPS6469880A (en) 1987-09-10 1987-09-10 Failure detecting valve

Publications (1)

Publication Number Publication Date
JPS6469880A true JPS6469880A (en) 1989-03-15

Family

ID=16850766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22679787A Pending JPS6469880A (en) 1987-09-10 1987-09-10 Failure detecting valve

Country Status (1)

Country Link
JP (1) JPS6469880A (en)

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